JPH0155148B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention connects the front vehicle body and the rear vehicle body by a connecting pin so that they can rotate in a horizontal plane, thereby making it possible to steer the vehicle. The present invention relates to a structure for arranging connecting pins in such a retractable working vehicle.

(b) Conventional technology Work vehicles like this have existed for a long time.

For example, Utility Model Application No. 58-157732, Utility Model Application No. 58-
178068, etc., the front body is permanently equipped with the engine, transmission, steering wheel, and other power-generating control parts, and while the rear body can be used as a variety of work vehicles, it can be exchanged for a variety of tasks. It corresponded to the

However, if the vehicle requires a power source other than running drive power on the rear vehicle side (for example, rotational drive power to drive a rotary shaft, etc.), it is quite difficult to construct a structure to introduce that power. For some reason, it was not possible to use any type of work vehicle; at best, it was just a replacement for a transport vehicle of a different length.

(c) Problems to be solved by the invention By the way, when rear car bodies of different lengths are replaced (regardless of whether they are of the same type or different types), the connecting points between the front and rear car bodies are As a result, when steering the vehicle, the turning radius of the front and rear bodies will be different, which may require a wider road or, in some cases, cause the vehicle to move further away from the road. Or go off the rails.

However, since these bendable work vehicles are often used for agriculture, forestry, etc., wide roads cannot be expected in the areas where they work, and this has been a problem.

(d) Means for solving the problems Accordingly, the present invention solves the above-mentioned problems by taking the following measures.

That is, the front and rear bodies are connected by a bendable and telescoping drive shaft, and connecting members extending from the front and rear bodies towards the other are vertically overlapped near the middle. By inserting the connecting pin vertically into the overlapping part,
In the bending type work vehicle, which is configured such that the front vehicle body and the rear vehicle body can rotate in a horizontal plane around the connecting pin, a work drive shaft can be accommodated in each of the connecting members, and in such a case, both the work drive shafts can be accommodated. The basic configuration is that the drive shaft is connected to the connecting pin in a vertically concentric position by a bending joint, and the positions of the connecting pin and the bending joint are set midway between the axles of the front vehicle body and the rear vehicle body. Furthermore, an additional configuration is that one of the connecting members is configured with an adjustment structure that can adjust the length.

(e) Effect This allows a drive source other than the travel drive source to be introduced to the rear vehicle body, and can be used to perform various tasks. In particular, if this drive source (work drive shaft) is housed in each connecting member for connecting the front and rear car bodies, it is safe, saves space, and allows the joints of both work drive shafts to be By making the connecting member coaxial with the connecting pin that connects the connecting member, there will be no problem even when the vehicle bends.

In addition, no matter what type of work vehicle is connected to the rear body, the above-mentioned joint (bending point) must always be located between the axles of the front and rear vehicles.
The turning radii of the front and rear bodies when turning are the same.

(F) Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Fig. 1 is a side view of a retractable work vehicle when the rear body is used as a dump loading platform, and Fig. 2 is a plan view as well. , Fig. 3 is a side view of the case where the rear vehicle body is a rotary work machine, Fig. 4 is a cross-sectional side view showing the connecting pin of the connecting member and the bending joint part of the work drive shaft, and Fig. 5 is the traveling work shaft. A partial cross-sectional view showing the surroundings,
FIG. 6 is a plan view of the main parts of another embodiment of the refraction type work vehicle.

The bending type work vehicle consists of a front vehicle body 1 and a rear vehicle body 2, and these two parts 1 and 2 are connected by a connecting pin 3 located in the middle. Therefore, both the front body 1 and the rear body 2 are rotatable within the horizontal plane around this connecting pin 3.
This allows steering and steering.

The front body 1 is equipped with a steering wheel 4, a seat 5, an engine 6, etc.
The steering wheel 4 is connected from a steering mechanism 8 comprising a pitman arm 7 and the like to an arm 9 installed on the rear vehicle 2 side by a connecting rod 10. Thereby, when the handle 4 is turned, each of the above-mentioned members is activated, and the front vehicle body 1 and the rear vehicle body 2 can be bent around the connecting pin 3.

The power of the engine 6 is transmitted to the transmission case 12, which is rotatably supported around the support shaft 11 in the longitudinal direction, and further,
The power is then transmitted to the axle 14 of the front wheels 13 of the front vehicle body 1. In addition, since a differential device is housed and installed in the differential gear case 15 (hereinafter referred to as differential case 15) at the center of this axle 14, steering is performed by this method. .

In addition to these, there is also a gear shift lever 1 on the front vehicle body 1 side that performs gear shifting operations inside the transmission case 12.
It is equipped with 17 types of pedals for 6, clutch, and brake.

Next is the rear body 2 side, which varies slightly depending on the type, but the rear wheels 18 and the differential case 1
9, the axle 20 etc. are permanently installed, and in addition to this, for example, if it is a transport work vehicle specification (see Figures 1 and 2), the loading platform 21 is supported by support pins 22, and the A hydraulic cylinder 23 for raising and lowering the loading platform 21 is also provided, and if the rotary work vehicle is used (see Fig. 3), a separate transmission case 24 which also serves as the aforementioned differential case 19 is installed. , hitch mechanism 25, lift mechanism 26, PTO mechanism 27, rotary mechanism 28
etc. are also provided.

By the way, the present invention is a bending type work vehicle having the above structure, in which the above-mentioned connecting pins 3 are arranged in the following manner.

That is, first, regarding the connection structure between the front body 1 and the rear body 2, a connecting member 29 is extended rearward from the transmission case 12 of the front body 1, and a connecting member 29 is also extended forward from the frame 30 of the rear body 2. 31 and the respective connecting members 29, 31
U-shaped connecting portions 32 and 33 are formed at the tips of the two, and both 32 and 33 are pivotally connected using the connecting pin 3 described above. Further, in the present invention, the connecting members 29, 31 are made hollow, and the working drive shafts 34, 35 are accommodated therein, and both 34, 35 are bent at a position concentric with the connecting pin 3 ( They are joined by a universal joint (36). Therefore, the working drive shaft 34,
35 passes through the connecting pin 3, so
This has to be made into two pins that are interrupted in the middle, and these two pins 3, 3 and the center of the bending joint 36 are on the same vertical line (see Figure 4). ). In addition, since the load is applied in the vertical direction as well, it is necessary to rotate in the vertical direction at this point, so the hole portions of the U-shaped connecting parts 32 and 33 through which the connecting pin 3 is inserted are Preferably, it has a slightly elongated hole shape.

Furthermore, since the front vehicle body 1 and the rear vehicle body 2 are bent and rotated around the connecting pin 3, the traveling drive shafts 37 and 38 are provided with bending joints 39 and 40 at slightly outer portions of the respective differential cases 15 and 19. In addition to making it bendable through the connector, its central end is fitted inside and out by spline fitting or the like to make it expandable and retractable (see Fig. 5).

On the other hand, after doing so, the position of the connecting pin 3 is placed between the axle 14 of the front vehicle body 1 and the axle shaft 20 of the rear vehicle body 2.

This arrangement may be such that the length of each connecting member 29, 31 is set according to the type of the rear vehicle body 2, or one or both of the connecting members 29, 31 may be arranged in a plurality of ways. The length of the rod 10 may also be adjusted by means of an adjustment structure 41 consisting of holes and pins (referring to FIG. 6).

(G) Effects of the Invention First, since working power can be introduced to the rear vehicle body 2 in addition to running power, the working range of the rear vehicle body 2 is thereby increased. Therefore, the work vehicle can be made more versatile.

In this case, the work drive shafts 34 and 35 are
Since they can be accommodated in the respective connecting members 29 and 31, they are not exposed and are safe.
It also saves space.

Further, the connecting pin 3 is always attached to the axle 14 of the front vehicle body 1.
Since it is located between the axle 15 of the rear vehicle body 2, the rotation radius of the front vehicle body 1 and the rear vehicle body 2 when turning is the same, that is, the respective rotation radii L1 and L2 from the rotation center O are equal. (See Figure 2), the front and rear wheels 13 and 18 take the same trajectory, and do not disturb unexplored terrain and are able to pass even on narrow roads.

Furthermore, if the arrangement of the connecting pins 3 is based on the adjustment structure 41 described above, each connecting member 29, 31 may be the same, and when stored, it can be stored at its shortest length, saving space. There are also advantages to not taking it.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a retractable work vehicle when the rear vehicle body is used as a dump platform, Fig. 2 is a plan view of the same, and Fig. 3 is a view of the rear vehicle body. FIG. 4 is a side view of the rotary work machine; FIG. 4 is a cross-sectional side view showing the connecting pin of the connecting member and the bending joint of the work drive shaft;
The figure is a partial cross-sectional view showing the area around the traveling work axis, and FIG. 6 is a plan view of the main parts showing another embodiment of the refraction type work vehicle. (Symbol), 1... Front car, 2... Rear car, 3... Connection pin, 14... Front wheel axle, 20... Rear wheel axle, 29... Connection member, 31... Connection member, 34
...Work drive shaft, 35...Work drive shaft, 36...
Bending joint, 37... Traveling drive shaft, 38... Traveling drive shaft, 41... Adjustment structure.

Claims (1)

[Scope of Claims] 1. The front vehicle body 1 and the rear vehicle body 2 are connected by bendable and extendable traveling drive shafts 37 and 38, and the front vehicle body 1
By vertically overlapping the connecting members 29 and 31 extending from the rear vehicle body 2 toward the other side near the middle, and inserting the connecting pin 3 vertically into this overlapping portion, the front vehicle body 1 and the rear Vehicle body 2
In the bending type work vehicle configured to be able to rotate in a horizontal plane around the connecting pin 3, work drive shafts 34 and 35 can be accommodated in the connecting members 29 and 31, respectively, and in such a case, both the aforementioned In addition to connecting the work drive shafts 34 and 35 to the connecting pin 3 in vertical and coaxial positions by means of a bending joint 36, the positions of the connecting pin 3 and the bending joint 36 are adjusted to both the front vehicle body 1 and the rear vehicle body 2. An arrangement structure of a connecting pin in a bending type work vehicle, characterized in that it is set between axles 14 and 20. 2. The refracting work vehicle according to claim 1, wherein one of the connecting members 29, 31 is constituted by an adjustment structure 41 that is made of a plurality of holes and pins and whose length can be adjusted. Arrangement structure of connecting pins in.